Anonymous
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Oct 18, 2013
01:52 PM
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Oct 18, 2013
01:52 PM
Hi, Im giving variable analog input(max rating 5V) to PSoC 5lp in high impedance mode.Now my question is can I directly give the potentiometer input to PSoC?How much resistance does any analog pin provide in this mode? Will the current damage PSoC?
Right now as precaution i have connected 1k in series with POT,Psoc is taking floating value when i switch the input near to zero volts.The reason being psoc is unable to detect ground because of that 1k ohm.
RISHI
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PSoC 5LP
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Anonymous
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Oct 18, 2013
04:25 PM
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Oct 18, 2013
04:25 PM
Hi upk
Of course in Analog high Z mode,
The input resistance should be exceed a few mega ohm, I guess.
Instability around Vss is cause from rail-to-rail characteristic
For example, acording to the ADC datasheet
Analog input has characteristic such as shown in this picture,
It's depending upon the setting.
Of course in Analog high Z mode,
The input resistance should be exceed a few mega ohm, I guess.
Instability around Vss is cause from rail-to-rail characteristic
For example, acording to the ADC datasheet
Analog input has characteristic such as shown in this picture,
It's depending upon the setting.
Oct 18, 2013
09:29 PM
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Oct 18, 2013
09:29 PM
If the pot ranges outside Vdda, there is a spec on allowed injection
current into a pin to prevent latchup. Also a max current of 100 uA
thru input protection diode.
Regards, Dana.